| /****************************************************************************** |
| * |
| * Module Name: hwvalid - I/O request validation |
| * |
| *****************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2016, Intel Corp. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions, and the following disclaimer, |
| * without modification. |
| * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| * substantially similar to the "NO WARRANTY" disclaimer below |
| * ("Disclaimer") and any redistribution must be conditioned upon |
| * including a substantially similar Disclaimer requirement for further |
| * binary redistribution. |
| * 3. Neither the names of the above-listed copyright holders nor the names |
| * of any contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| * |
| * NO WARRANTY |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGES. |
| */ |
| |
| #include "acpi.h" |
| #include "accommon.h" |
| |
| #define _COMPONENT ACPI_HARDWARE |
| ACPI_MODULE_NAME ("hwvalid") |
| |
| /* Local prototypes */ |
| |
| static ACPI_STATUS |
| AcpiHwValidateIoRequest ( |
| ACPI_IO_ADDRESS Address, |
| UINT32 BitWidth); |
| |
| |
| /* |
| * Protected I/O ports. Some ports are always illegal, and some are |
| * conditionally illegal. This table must remain ordered by port address. |
| * |
| * The table is used to implement the Microsoft port access rules that |
| * first appeared in Windows XP. Some ports are always illegal, and some |
| * ports are only illegal if the BIOS calls _OSI with a WinXP string or |
| * later (meaning that the BIOS itelf is post-XP.) |
| * |
| * This provides ACPICA with the desired port protections and |
| * Microsoft compatibility. |
| * |
| * Description of port entries: |
| * DMA: DMA controller |
| * PIC0: Programmable Interrupt Controller (8259A) |
| * PIT1: System Timer 1 |
| * PIT2: System Timer 2 failsafe |
| * RTC: Real-time clock |
| * CMOS: Extended CMOS |
| * DMA1: DMA 1 page registers |
| * DMA1L: DMA 1 Ch 0 low page |
| * DMA2: DMA 2 page registers |
| * DMA2L: DMA 2 low page refresh |
| * ARBC: Arbitration control |
| * SETUP: Reserved system board setup |
| * POS: POS channel select |
| * PIC1: Cascaded PIC |
| * IDMA: ISA DMA |
| * ELCR: PIC edge/level registers |
| * PCI: PCI configuration space |
| */ |
| static const ACPI_PORT_INFO AcpiProtectedPorts[] = |
| { |
| {"DMA", 0x0000, 0x000F, ACPI_OSI_WIN_XP}, |
| {"PIC0", 0x0020, 0x0021, ACPI_ALWAYS_ILLEGAL}, |
| {"PIT1", 0x0040, 0x0043, ACPI_OSI_WIN_XP}, |
| {"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP}, |
| {"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP}, |
| {"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP}, |
| {"DMA1", 0x0081, 0x0083, ACPI_OSI_WIN_XP}, |
| {"DMA1L", 0x0087, 0x0087, ACPI_OSI_WIN_XP}, |
| {"DMA2", 0x0089, 0x008B, ACPI_OSI_WIN_XP}, |
| {"DMA2L", 0x008F, 0x008F, ACPI_OSI_WIN_XP}, |
| {"ARBC", 0x0090, 0x0091, ACPI_OSI_WIN_XP}, |
| {"SETUP", 0x0093, 0x0094, ACPI_OSI_WIN_XP}, |
| {"POS", 0x0096, 0x0097, ACPI_OSI_WIN_XP}, |
| {"PIC1", 0x00A0, 0x00A1, ACPI_ALWAYS_ILLEGAL}, |
| {"IDMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP}, |
| {"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL}, |
| {"PCI", 0x0CF8, 0x0CFF, ACPI_OSI_WIN_XP} |
| }; |
| |
| #define ACPI_PORT_INFO_ENTRIES ACPI_ARRAY_LENGTH (AcpiProtectedPorts) |
| |
| |
| /****************************************************************************** |
| * |
| * FUNCTION: AcpiHwValidateIoRequest |
| * |
| * PARAMETERS: Address Address of I/O port/register |
| * BitWidth Number of bits (8,16,32) |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Validates an I/O request (address/length). Certain ports are |
| * always illegal and some ports are only illegal depending on |
| * the requests the BIOS AML code makes to the predefined |
| * _OSI method. |
| * |
| ******************************************************************************/ |
| |
| static ACPI_STATUS |
| AcpiHwValidateIoRequest ( |
| ACPI_IO_ADDRESS Address, |
| UINT32 BitWidth) |
| { |
| UINT32 i; |
| UINT32 ByteWidth; |
| ACPI_IO_ADDRESS LastAddress; |
| const ACPI_PORT_INFO *PortInfo; |
| |
| |
| ACPI_FUNCTION_TRACE (HwValidateIoRequest); |
| |
| |
| /* Supported widths are 8/16/32 */ |
| |
| if ((BitWidth != 8) && |
| (BitWidth != 16) && |
| (BitWidth != 32)) |
| { |
| ACPI_ERROR ((AE_INFO, |
| "Bad BitWidth parameter: %8.8X", BitWidth)); |
| return (AE_BAD_PARAMETER); |
| } |
| |
| PortInfo = AcpiProtectedPorts; |
| ByteWidth = ACPI_DIV_8 (BitWidth); |
| LastAddress = Address + ByteWidth - 1; |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Address %8.8X%8.8X LastAddress %8.8X%8.8X Length %X", |
| ACPI_FORMAT_UINT64 (Address), ACPI_FORMAT_UINT64 (LastAddress), |
| ByteWidth)); |
| |
| /* Maximum 16-bit address in I/O space */ |
| |
| if (LastAddress > ACPI_UINT16_MAX) |
| { |
| ACPI_ERROR ((AE_INFO, |
| "Illegal I/O port address/length above 64K: %8.8X%8.8X/0x%X", |
| ACPI_FORMAT_UINT64 (Address), ByteWidth)); |
| return_ACPI_STATUS (AE_LIMIT); |
| } |
| |
| /* Exit if requested address is not within the protected port table */ |
| |
| if (Address > AcpiProtectedPorts[ACPI_PORT_INFO_ENTRIES - 1].End) |
| { |
| return_ACPI_STATUS (AE_OK); |
| } |
| |
| /* Check request against the list of protected I/O ports */ |
| |
| for (i = 0; i < ACPI_PORT_INFO_ENTRIES; i++, PortInfo++) |
| { |
| /* |
| * Check if the requested address range will write to a reserved |
| * port. Four cases to consider: |
| * |
| * 1) Address range is contained completely in the port address range |
| * 2) Address range overlaps port range at the port range start |
| * 3) Address range overlaps port range at the port range end |
| * 4) Address range completely encompasses the port range |
| */ |
| if ((Address <= PortInfo->End) && (LastAddress >= PortInfo->Start)) |
| { |
| /* Port illegality may depend on the _OSI calls made by the BIOS */ |
| |
| if (AcpiGbl_OsiData >= PortInfo->OsiDependency) |
| { |
| ACPI_DEBUG_PRINT ((ACPI_DB_IO, |
| "Denied AML access to port 0x%8.8X%8.8X/%X (%s 0x%.4X-0x%.4X)", |
| ACPI_FORMAT_UINT64 (Address), ByteWidth, PortInfo->Name, |
| PortInfo->Start, PortInfo->End)); |
| |
| return_ACPI_STATUS (AE_AML_ILLEGAL_ADDRESS); |
| } |
| } |
| |
| /* Finished if address range ends before the end of this port */ |
| |
| if (LastAddress <= PortInfo->End) |
| { |
| break; |
| } |
| } |
| |
| return_ACPI_STATUS (AE_OK); |
| } |
| |
| |
| /****************************************************************************** |
| * |
| * FUNCTION: AcpiHwReadPort |
| * |
| * PARAMETERS: Address Address of I/O port/register to read |
| * Value Where value is placed |
| * Width Number of bits |
| * |
| * RETURN: Status and value read from port |
| * |
| * DESCRIPTION: Read data from an I/O port or register. This is a front-end |
| * to AcpiOsReadPort that performs validation on both the port |
| * address and the length. |
| * |
| *****************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiHwReadPort ( |
| ACPI_IO_ADDRESS Address, |
| UINT32 *Value, |
| UINT32 Width) |
| { |
| ACPI_STATUS Status; |
| UINT32 OneByte; |
| UINT32 i; |
| |
| |
| /* Truncate address to 16 bits if requested */ |
| |
| if (AcpiGbl_TruncateIoAddresses) |
| { |
| Address &= ACPI_UINT16_MAX; |
| } |
| |
| /* Validate the entire request and perform the I/O */ |
| |
| Status = AcpiHwValidateIoRequest (Address, Width); |
| if (ACPI_SUCCESS (Status)) |
| { |
| Status = AcpiOsReadPort (Address, Value, Width); |
| return (Status); |
| } |
| |
| if (Status != AE_AML_ILLEGAL_ADDRESS) |
| { |
| return (Status); |
| } |
| |
| /* |
| * There has been a protection violation within the request. Fall |
| * back to byte granularity port I/O and ignore the failing bytes. |
| * This provides Windows compatibility. |
| */ |
| for (i = 0, *Value = 0; i < Width; i += 8) |
| { |
| /* Validate and read one byte */ |
| |
| if (AcpiHwValidateIoRequest (Address, 8) == AE_OK) |
| { |
| Status = AcpiOsReadPort (Address, &OneByte, 8); |
| if (ACPI_FAILURE (Status)) |
| { |
| return (Status); |
| } |
| |
| *Value |= (OneByte << i); |
| } |
| |
| Address++; |
| } |
| |
| return (AE_OK); |
| } |
| |
| |
| /****************************************************************************** |
| * |
| * FUNCTION: AcpiHwWritePort |
| * |
| * PARAMETERS: Address Address of I/O port/register to write |
| * Value Value to write |
| * Width Number of bits |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Write data to an I/O port or register. This is a front-end |
| * to AcpiOsWritePort that performs validation on both the port |
| * address and the length. |
| * |
| *****************************************************************************/ |
| |
| ACPI_STATUS |
| AcpiHwWritePort ( |
| ACPI_IO_ADDRESS Address, |
| UINT32 Value, |
| UINT32 Width) |
| { |
| ACPI_STATUS Status; |
| UINT32 i; |
| |
| |
| /* Truncate address to 16 bits if requested */ |
| |
| if (AcpiGbl_TruncateIoAddresses) |
| { |
| Address &= ACPI_UINT16_MAX; |
| } |
| |
| /* Validate the entire request and perform the I/O */ |
| |
| Status = AcpiHwValidateIoRequest (Address, Width); |
| if (ACPI_SUCCESS (Status)) |
| { |
| Status = AcpiOsWritePort (Address, Value, Width); |
| return (Status); |
| } |
| |
| if (Status != AE_AML_ILLEGAL_ADDRESS) |
| { |
| return (Status); |
| } |
| |
| /* |
| * There has been a protection violation within the request. Fall |
| * back to byte granularity port I/O and ignore the failing bytes. |
| * This provides Windows compatibility. |
| */ |
| for (i = 0; i < Width; i += 8) |
| { |
| /* Validate and write one byte */ |
| |
| if (AcpiHwValidateIoRequest (Address, 8) == AE_OK) |
| { |
| Status = AcpiOsWritePort (Address, (Value >> i) & 0xFF, 8); |
| if (ACPI_FAILURE (Status)) |
| { |
| return (Status); |
| } |
| } |
| |
| Address++; |
| } |
| |
| return (AE_OK); |
| } |
